diff options
Diffstat (limited to 'drivers/mmc/host/mmci.c')
| -rw-r--r-- | drivers/mmc/host/mmci.c | 39 |
1 files changed, 27 insertions, 12 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 4ab0c622dff3..4c78783e5e1a 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -674,6 +674,7 @@ static u32 ux500v2_get_dctrl_cfg(struct mmci_host *host) static bool ux500_busy_complete(struct mmci_host *host, u32 status, u32 err_msk) { void __iomem *base = host->base; + int retries = 10; if (status & err_msk) { /* Stop any ongoing busy detection if an error occurs */ @@ -694,21 +695,35 @@ static bool ux500_busy_complete(struct mmci_host *host, u32 status, u32 err_msk) * Note that, the card may need a couple of clock cycles before * it starts signaling busy on DAT0, hence re-read the * MMCISTATUS register here, to allow the busy bit to be set. - * Potentially we may even need to poll the register for a - * while, to allow it to be set, but tests indicates that it - * isn't needed. */ if (host->busy_state == MMCI_BUSY_DONE) { - status = readl(base + MMCISTATUS); - if (status & host->variant->busy_detect_flag) { - writel(readl(base + MMCIMASK0) | - host->variant->busy_detect_mask, - base + MMCIMASK0); - - host->busy_status = status & (MCI_CMDSENT | MCI_CMDRESPEND); - host->busy_state = MMCI_BUSY_WAITING_FOR_START_IRQ; - return false; + /* + * Save the first status register read to be sure to catch + * all bits that may be lost will retrying. If the command + * is still busy this will result in assigning 0 to + * host->busy_status, which is what it should be in IDLE. + */ + host->busy_status = status & (MCI_CMDSENT | MCI_CMDRESPEND); + while (retries) { + status = readl(base + MMCISTATUS); + /* Keep accumulating status bits */ + host->busy_status |= status & (MCI_CMDSENT | MCI_CMDRESPEND); + if (status & host->variant->busy_detect_flag) { + writel(readl(base + MMCIMASK0) | + host->variant->busy_detect_mask, + base + MMCIMASK0); + host->busy_state = MMCI_BUSY_WAITING_FOR_START_IRQ; + return false; + } + retries--; } + dev_dbg(mmc_dev(host->mmc), "no busy signalling in time\n"); + writel(host->variant->busy_detect_mask, base + MMCICLEAR); + writel(readl(base + MMCIMASK0) & + ~host->variant->busy_detect_mask, base + MMCIMASK0); + host->busy_state = MMCI_BUSY_DONE; + host->busy_status = 0; + return true; } /* |